Hot-rolled steel sheet excellent in weldability and deburring property and production method thereof

A hot-rolled steel plate and burr-resistant technology, which is applied in the field of hot-rolled steel plate and its preparation, can solve problems such as cold welding, resistance heating, and reduce the soundness of welded parts, and achieve excellent weldability and deburring properties and improved soundness Effect

Active Publication Date: 2019-02-19
浦项股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned technology mainly uses alloy components such as Si, Mn, Al, Mo, etc. to prepare a dual-phase steel with a ferrite-bainite composite structure. Serious, or, in the case of operation with reduced input current value, cold welding will occur
In addition, since Si, Mn, Al, etc. form oxides during welding, there is a problem that the soundness of the welded part will be reduced

Method used

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  • Hot-rolled steel sheet excellent in weldability and deburring property and production method thereof
  • Hot-rolled steel sheet excellent in weldability and deburring property and production method thereof
  • Hot-rolled steel sheet excellent in weldability and deburring property and production method thereof

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Embodiment Construction

[0074] Hereinafter, the present invention will be described more specifically by way of examples. However, it should be noted that the following examples are merely examples for explaining the present invention in more detail, and do not limit the scope of the present invention. This is because the protection scope of the present invention is determined based on the content described in the claims and the content reasonably inferred from the content.

[0075] (Example)

[0076] A steel slab satisfying the composition system described in Table 1 below was heated to 1250° C., and hot finish rolling was performed at the temperature described in Table 2 below. Then, perform primary cooling at a cooling rate of 70°C / sec until the temperature reaches 680°C, followed by air cooling for 6 seconds, and perform secondary cooling at a cooling rate of 70°C / sec until the temperature reaches 450°C, and then in the following Winding was performed at the temperature described in Table 2.

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Abstract

The purpose of an aspect of the present invention is to provide hot-rolled high-burring steel having excellent electric resistance welding property, thereby facilitating welding operations, and a method for manufacturing the same.

Description

technical field [0001] The invention relates to a hot-rolled steel plate excellent in weldability and deburring property and a preparation method thereof. Background technique [0002] Recently, in the automotive industry, in order to make cars compatible with reducing CO 2 High Tensile Strength Steel (High Tensile Strength Steel) is used for the body of the car to reduce the weight of emissions and strengthen the body to improve crash safety. High-strength steel sheets are cost-effective materials that fulfill such opposite requirements, and their application volume will gradually increase in response to stricter regulations in the future. In particular, it plays an increasing role as concerns about crash safety increase. [0003] Generally, the higher the strength of the material, the poorer its formability. Steel materials are no exception, and until now attempts have been made to make steel compatible with high strength and high ductility. In addition, the properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/02C21D9/46B21B3/00
CPCC21D8/02C21D8/0226C21D9/46C21D2211/002C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/38
Inventor 徐石宗金成一朱世燉赵原兑
Owner 浦项股份有限公司
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